file_util.py 文件源码

def move_file (src, dst,
               verbose=1,
               dry_run=0):

    """Move a file 'src' to 'dst'.  If 'dst' is a directory, the file will
    be moved into it with the same name; otherwise, 'src' is just renamed
    to 'dst'.  Return the new full name of the file.

    Handles cross-device moves on Unix using 'copy_file()'.  What about
    other systems???
    """
    from os.path import exists, isfile, isdir, basename, dirname
    import errno

    if verbose >= 1:
        log.info("moving %s -> %s", src, dst)

    if dry_run:
        return dst

    if not isfile(src):
        raise DistutilsFileError("can't move '%s': not a regular file" % src)

    if isdir(dst):
        dst = os.path.join(dst, basename(src))
    elif exists(dst):
        raise DistutilsFileError(
              "can't move '%s': destination '%s' already exists" %
              (src, dst))

    if not isdir(dirname(dst)):
        raise DistutilsFileError(
              "can't move '%s': destination '%s' not a valid path" %
              (src, dst))

    copy_it = False
    try:
        os.rename(src, dst)
    except OSError as e:
        (num, msg) = e.args
        if num == errno.EXDEV:
            copy_it = True
        else:
            raise DistutilsFileError(
                  "couldn't move '%s' to '%s': %s" % (src, dst, msg))

    if copy_it:
        copy_file(src, dst, verbose=verbose)
        try:
            os.unlink(src)
        except OSError as e:
            (num, msg) = e.args
            try:
                os.unlink(dst)
            except OSError:
                pass
            raise DistutilsFileError(
                  "couldn't move '%s' to '%s' by copy/delete: "
                  "delete '%s' failed: %s"
                  % (src, dst, src, msg))
    return dst